angular - @angular/common/http 没有导出成员 'RequestOptions'

Question

我想使用 firebase 函数用 Angular 6 打磨电子邮件，但 Angular 抛出此错误:

error TS2305: Module '"E:/project/node_modules/@angular/common/http"'has no exported member 'RequestOptions'.

import { Injectable } from '@angular/core';
import { NgForm } from '@angular/forms';
import { HttpClient, HttpHeaders, RequestOptions } from '@angular/common/http';
import 'rxjs';
@Injectable()
export class MailerService {
    constructor(private httpClient: HttpClient) { }
    send(form: NgForm) {
        let url = 'TheUrlOfMyFunction';
        let params: URLSearchParams = new URLSearchParams();
        let options = {headers: new HttpHeaders({'Content-Type':  'application/json'})};
        params.set('to', form.value['emailTo']);
        params.set('from', form.value['emailFrom']);
        params.set('subject', form.value['object']);
        params.set('content', form.value['text']);
        return this.httpClient.post(url, params, options)
                        .toPromise()
                        .then( res => { console.log(res) })
                        .catch(err => { console.log(err) })
    }
}

Answer 1

RequestOptions 在“@angular/common/http”模块中不可用。它曾经在“@angular/http”模块中可用，但现在在最新的 Angular 版本中已被弃用。您现在可以创建一个像这样的局部变量 -

  const httpOptions = {
  headers: new HttpHeaders({
    'Content-Type':  'application/json'
    })
  };

您可以在进行 http 调用时使用 httpOptions。

return this.http.get('PRODUCT_URL', httpOptions)